共查询到19条相似文献，搜索用时 875 毫秒
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霞石正长岩是一种新型玻陶原料,在国外广为开发利用。由于它含大量碱金属和碱土金属元素。因此在玻陶烧成工艺过程中能起到助熔作用,加带烧成反应,缩短烧成时间,降低烧成温度,提高产品稳定性,起到有降耗的经济效果。我省是全国三大玻璃生产地之一,又是陶瓷之乡,同时拥有矿石储量大、质量好、交能运输条件优越的霞石正长岩配套资源,国内实属罕见。在当今长石资源匮管情况下,应充分利用这一优势,大力推广开发利用当地资源, 相似文献
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对吉林省永胜霞石正长岩进行磁选除铁试验,确定该岩体的合理选矿条件和最佳工艺流程,精矿产品的杂质含量,为我省霞石正长岩开发利用提供试验依据。 相似文献
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针对国内铝土矿和钾盐短缺、严重依赖进口的现状,综合开发利用储量巨大的非水溶性钾矿具重要意义.本实验以具有典型代表性的云南个旧白云山霞石正长岩为原料,研究了以碳酸钠为助剂烧结反应过程中可能存在的化学反应;并以热力学计算结果为指导,研究了霞石正长岩-碳酸钠体系的烧结配比、烧结时间和烧结温度对霞石正长岩分解率的影响.实验结果表明:在烧结温度1 103 K、烧结时间1 h、霞石正长岩与助剂碳酸钠质量比为1∶0.75时,霞石正长岩的分解率可达98.0%.对霞石正长岩热分解过程的动力学研究结果表明:该过程符合Crank-Ginstling-Braunshtein方程,其表观活化能为78.75 kJ/mol;根据阿伦尼乌斯公式对反应时间进行了预测,认为离子扩散穿透厚度增加的固膜是造成理论与实际反应时间出现误差的主要原因. 相似文献
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Isotopic Geochronology of the Xianghongdian Alkaline Complex, Northern Margin of the Dabie Mountains, China 总被引：1，自引：0，他引：1
YANG Zhuliang SHEN Weizhou SHEN Jialin TAO Kuiyuan XIE Fanggui Nanjing Institute of Geology Mineral Resources Nanjing Department of Earth Sciences Nanjing University Nanjing 《《地质学报》英文版》1999,73(4):404-410
To the north of the Qinling-Dabie orogen there exists a Mesozoic (K1) granite-syenite belt called the Beihuaiyang granite-syenite belt, in which the Xianghongdian alkaline complex outcrops in the Devonian Foziling schist and also intruded into the slightly earlier volcanic rocks. This alkaline complex is composed of syenite, alkaline syenite and nepheline syenite, but the nepheline syenite occurs inside the alkaline syenite in the pod-like, irregular, lenticular or layered shape. Researches on the petrogenesis of the alkaline complex and the relationship between the alkaline syenite and the nepheline syenite must rely on precise isotopic ages. Previous researches have reported iso-topic dating results merely by the 40Ar/39Ar method on hornblende and biotite separated from the alkaline syenite and nepheline syenite. In view of this, the authors have made fairly detailed isotopic geochronological studies of the alkaline syenite and nepheline syenite by using Rb-Sr isochron for the whole rock and minerals, 相似文献
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蒙古国呼勒德地区正长岩锆石SHRIMP铀-铅年龄及其地质意义 总被引：1，自引：0，他引：1
呼勒德稀土元素矿化区位于蒙古国中戈壁省南部, 区内稀土元素和金矿(化)点星罗棋布, 为蒙古中南部最重要的金属矿化集中区之一。在所有上述矿床(点)中, 稀土元素矿化在下二叠统火山-沉积岩内呈似层状、脉状和透镜体状产出, 并且与呼勒德碱性正长岩株具有密切空间分布关系。本次研究对呼勒德正长岩进行了锆石SHRIMP铀-铅同位素年龄测定, 所获同位素年龄值为(214.3 ± 2.5)Ma, MSWD值为0.52, 属中生代印支期。根据上述同位素年代学数值, 同时结合其他地质与地球化学证据, 可以推测, 中生代时期, 受古陆块内部构造应力调整作用影响, 呼勒德地区一带及东西两侧曾发生过强烈构造-岩浆活动, 并且形成碱性正长岩株及相关的稀土元素矿(化)点。印支期碱性岩浆活动不仅为稀土元素矿(化)点的形成提供了物质、动力和热力来源, 而且是成矿流体对流循环的“发动机”。对比分析结果表明, 呼勒德碱性正长岩体的形成时间与南蒙古鲁金郭勒碱性花岗斑岩脉及相关稀土元素矿床形成时代大体相似, 它们均是地壳演化特定阶段混源(壳、幔源)岩浆活动的产物。 相似文献
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赛马碱性杂岩体位于我国辽东半岛,是一个典型的铀-铌和稀土多金属矿化杂岩体,富含重稀土,其复杂的演化过程和稀土元素富集机制仍没有得到有效约束。本文对该碱性杂岩体中角闪辉石正长岩、正长岩、黑云正长岩、云霓霞石正长岩和异霞正长岩5类岩石及锆石的元素地球化学特征进行了系统研究,并开展了特征矿物包裹体的显微岩相学研究,旨在限定杂岩体母岩浆的演化路径,揭示稀土元素的富集机制。研究结果显示,赛马碱性杂岩体的母岩浆经历了由钾质碱性(角闪辉石正长岩、正长岩和黑云正长岩),到钾质过碱性(云霓霞石正长岩),向钠质过碱性(异霞正长岩)的充分演化。在演化过程中赛马碱性杂岩体母岩浆的体系状态发生了明显变化,碱性岩浆演化受流体不饱和的纯岩浆体系的控制,而过碱性岩浆岩则形成于流体过饱和的岩浆体系,且异霞正长岩母岩浆流体的饱和程度明显高于云霓霞石正长岩的母岩浆。研究还显示,钾质碱性岩浆稀土元素的地球化学行为主要受控于磷灰石等矿物的分离结晶,而成矿的钠质过碱性岩浆稀土、锆和铌等元素的富集成矿则主要受富CO_(2)的高盐度岩浆热液的控制。 相似文献
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A. H. El Afandy H. A. El Nahas N. A. Dawood H. M. Asran 《Arabian Journal of Geosciences》2013,6(8):2855-2871
The upper Cretaceous Abu Khruq ring complex (ARC) is located in the South Eastern Desert between latitudes 24°00′10′′ and 24°03′15′′ N, and longitudes 33°54′50′′ and 33°58′ E and has a roughly circular shape with a diameter of 7 km. ARC is built up by major extrusion of alkaline volcanic rocks comprising mainly rhyolite porphyry and alkaline trachyte rocks at the center of the ring complex followed by successive intrusions of alkaline gabbro and syenitic rocks comprising quartz syenite (oversaturated), syenite (saturated), and nepheline syenite (undersaturated). Petrographical and geochemical studies were carried out for the rocks of the forming ARC. For mineralogical and radioactive investigations, samples were collected from the most promising locations representing the hematitized nepheline syenite, nepheline syenite pegmatites, and quartz syenite. The most important minerals comprise: phosphuranylite, zircon, monazite, xenotime, plumbopyrochlore, pyrite, huttonite, apatite, REE mineral, rutile, and atacamite. The hematitized nepheline syenite is the most U- and Th-rich rocks, where eU content in this rock ranges from 375 to 788 ppm with an average 502 ppm and the average eTh content is 2,345 ppm ranging from 1,918 to 3,067 ppm. The pegmatite syenite and quartz syenite contain relatively low concentrations of U and Th, where the average eU content are 11 and 16 ppm and average eTh contents are 27 and 327 ppm, respectively. 相似文献
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《矿物学报》2013,(Z1)
The application of K-rich nephline syenite ores would produce some tailings, which will cause many disadvantages such as more land occupation. In this research, an process was obtained to extract rare earth from the K-rich nephline syenite tailings of Gejiu, Yunnan province, China. This tailings mainly composed of K-feldspar, biotite, magnetite, andradite, nepheline and 0.1% rare earth. The chemical compositions are shown in Table 1. 相似文献
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The Astrophyllite Bay Complex in East Greenland (part of the Palaeogene North Atlantic Igneous Province) consists of an alkaline diorite plug, with detached trachyandesitic pillows, surrounded by co-magmatic syenite that was emplaced into Archaean basement. The diorite intrusion has yielded a 47.11 ± 0.68 Ma Rb-Sr isochron age. Saw-cut profiles through pillow-syenite-gneiss sections have been taken to resolve close spatial elemental and isotopic (Sr-Nd-Hf-Pb-O) variations. The diorite and syenite formed from alkaline basaltic, mantle-derived, melts with complex histories of prolonged assimilation and fractional crystallisation. Each evolved to different extents in separate magma chambers during the establishment of new plumbing systems in the Kangerlussuaq area. The diorite is dominated by lower crustal, granulite facies contamination, whereas the syenite shows evidence for greater degrees of upper crustal amphibolite facies contamination, indicating stalling and fractionation of magmas at different levels within the crust. The syenite and diorite magmas were subsequently emplaced as separate pulses into the basement gneisses at Astrophyllite Bay giving rise to superimposed local contamination trends between pillow/syenite and syenite/gneiss, respectively. 相似文献
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The Pan-African (572 Ma) Puttetti syenite (A-type granitoid)-pyroxenite association intrudes the high-grade metamorphic terrain of the Trivandrum Block, South India. Field evidence indicates the contemporaneous nature of syenitic and pyroxenitic liquids. The occurrence of a mixed-rock (~70% syenite and 30% pyroxenite) with an emulsion-like texture, and the occurrence of pyroxenite globules in syenite, is interpreted as relics of immiscible magmas. Both syenite and pyroxenite show similar mineral assemblage (with major minerals having overlapping compositions), but the relative proportions differ. Major element and trace element partitioning trends, parallel REE patterns, and similar Sr initial isotope compositions are in accord with behavior either predicted or measured for immiscible melts in experimental and/or natural systems. The more pronounced Eu anomalies and LREE/HREE ratios of syenite and pyroxenite (relative to the mixed-rock) is related to fractionation caused by immiscible separation. The proposed origin of the Puttetti pluton involves the intrusion of a magma whose bulk composition is that of the mixed-rock. This melt behaved immiscibly and split into two fractions, which produced the syenite and pyroxenite magmas.Editorial responsibility: T. Grove 相似文献
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Nepheline- and analcime-bearing syenite occurs at the uppercontact of a quartz diabase sill with the Lockatong Argilliteat Brookville, New Jersey. The syenite is intimately mixed withgranophyre that formed by fractional crystallization of basalticmagma and accumulated near the top of the sill. Some of theresidual liquid now represented by granophyre reacted with silica-poor,sodium-rich argillite to form the syenite. Initial Sr87/Sr86 ratios (assuming an age of 190 m. y.) are0.7144–0.7147 for the unmetamorphosed and the hornfelsedargillite, 0.7067 for the granophyre, 0.7058 for the diabase,and intermediate values of 0.7128–0.7131 for the syenite. The isotopic evidence agrees with field, petrographic, experimental,and chemical data supporting assimilation. Alternative hypothesesof syenite formation by separate intrusion, differentiation,or partial melting of Lockatong Argillite are contradicted bythe data. Isotopic and normative data strongly suggest that syenite formedfrom argillite and granophyre in the proportions three or fourto one; during the assimilation process the country rock actedas solvent and the intrusive as solute. 相似文献